Prototype 4.7 THz array local oscillator for GUSTO

B. Mirzaei, J. R.G. Silva, D. Hayton, W. Laauwen, Y. Gan, Q. Hu, Christopher Groppi, J. R. Gao

Research output: Contribution to conferencePaperpeer-review


We present an 8-beam local oscillator (LO) for the astronomically significant [OI] line at 4.7 THz. The beams are generated using a quantum cascade laser (QCL) in combination with a Fourier phase grating. The grating is fully characterized using a third order distributed feedback (DFB) QCL with a single mode emission at 4.7 THz as the input. The measured diffraction efficiency of 74.3 % is in an excellent agreement with the calculated result of 75.4 % using a 3D simulation. We show that the power distribution among the diffracted beams is uniform enough for pumping an array receiver. To validate the grating bandwidth, we apply a far-infrared (FIR) gas laser emission at 5.3 THz as the input and find a very similar performance in terms of efficiency, power distribution and spatial configuration of the diffracted beams. Both results represent the highest operating frequencies of THz phase gratings reported in the literature. By injecting one of the eight diffracted 4.7 THz beams into a superconducting hot electron bolometer (HEB) mixer, we find that the coupled power, taking the optical loss into account, is in consistency with the QCL power value. This paper has been published in Optics Express 25(24), 29587 (2017), and is submitted to ISSTT 2018 as a direct way of exposure to the most relevant community.

Original languageEnglish (US)
Number of pages6
StatePublished - 2018
Event29th IEEE International Symposium on Space Terahertz Technology, ISSTT 2018 - Pasadena, United States
Duration: Mar 26 2018Mar 28 2018


Conference29th IEEE International Symposium on Space Terahertz Technology, ISSTT 2018
Country/TerritoryUnited States

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Space and Planetary Science
  • Electrical and Electronic Engineering
  • Atomic and Molecular Physics, and Optics
  • Radiation


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